I find the lacking/inconsistent integration between Atlassian tools annoying.
Why is there no useful Bitbucket <-> Confluence integration? Why is the markdown or other syntax in Jira so inconsistent. You have to use different stiles in Jira Comments, acceptance criteria and Story titles.
But to be fair with Jira: Often it is the using company who misconfigures in an absolute mess as they try to reimplement some horrible SAP CRM flow which they wanted to get away from before.